What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
May I know which form you are working at?
The problem might be that you have edited or deleted a field, and the old tag is still in the email notification.
Choose the existing notification.
In your compose email, find the field that shows blank in your email, then find the form field in your right and click it. It will show you the correct form field tag for it.
You could also create a new notification using this guide: http://www.jotform.com/help/25-Setting-Up-Email-Notifications. I hope that helps.